It seems like it would be difficult to overlook the lack of an inscription on the back of the pin.
There are, however, some genuine DVC pins for sale on ebay, most of which are being sold by a guy in Hawaii. I wrote him and asked if he was a DVC member. He replied that he was not, and that he was the "buy and sell guy" for he and his friends.
Curiouser and curiouser. He has sold at least two pins at $45 each and now has the set of two pins, card included, for sale at $150.